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https://issues.apache.org/jira/browse/SPARK-13100?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yang Wang updated SPARK-13100:
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Attachment: screenshot-1.png
> improving the performance of stringToDate method in DateTimeUtils.scala
> -----------------------------------------------------------------------
>
> Key: SPARK-13100
> URL: https://issues.apache.org/jira/browse/SPARK-13100
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.5.2, 1.6.0
> Reporter: Yang Wang
> Labels: performance
> Attachments: screenshot-1.png
>
>
> In the stringToDate method in DateTimeUtils.scala, in order to create a
> Calendar instance we create a brand new TimeZone instance every time by
> calling TimeZone.getTimeZone("GMT"). In jdk1.7, however, this method is
> synchronized, thus such an approach can cause significant performance loss.
> Since the same time zone is used each time we call that method, I think we
> should create a val in the DateTimeUtils singleton object to hold that
> TimeZone, and use it every time.
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